Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

3 hosts · 305 ms

HostCertsFirst seenLast seenDNS
coeo-inkasso.ch 4 2026-04-15 2026-08-13 ok
test.coeo-inkasso.ch 4 2026-06-06 2026-10-04 ok
www.coeo-inkasso.ch 4 2026-04-15 2026-08-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/coeo-inkasso.ch (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/coeo-inkasso.ch.